Steam-actuated valve



(No Medel.) 2 vsheen-sheet 2.

H. lKESSLBRl Y STEAM AGTUATED VALVE.

Ne. 290,063. Petemed Dee. 11, 18.83..

515-21. Eer

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WITNEEEEE; Ier-gamma 4a bottom view of the main valve.

UNITED STATES PATENT @Erica HENRY KESSLER, OF SAN-FRANCISCO, CALIFORNIA.

STEAM-ACTUATED VALVE.

SPECIFICATION forming part of Letters Patent No. 290,063, dated December-11, 1883.

Application filed April 19, 1883. (No model.) I

To all whom, it may concern:

Be it known that I, HENRY KnssLnR, a citizen of the United States, residing at San Francisco, in the county of San Francisco and State of California, have invented certain new and useful Improvements in Steam-Actuated Valves for Direct-Acting Steam-Engines, of which the following is a specification.

The object of my invention is to provide a steam-engine with an improved steam-actuated valve, by means of which leakage at the. steam-ports will be prevented, and great economy will be had in the working of the engine. This object I accomplish by means of the mechanism illustrated in' the accompanying drawings, in which-' Figure'l is a longitudinal section through the steam-cylinder and steam-chest. Fig. 2 is a cross-sectional view of the same.

Fig. 4 is a bottom view of the reversing-valve. Fig. is a plan view of the valve-seat.

Similar letters of reference are used to indicate like parts throughout the several views.

A represents the steam-cylinder, and B and B the piston and piston-rod.

C is the steam-chest, which is provided with the usual steam-ports, C- and G2, communicating with either end of the main cylinder. This steam-chest isalso provided with two other steam ports or passages, D D, the uses of which will be hereinafter explained.

Vithin the steam-chest I fit an auxiliary piston or plunger, E, having two heads, E E, connected together by the main body of the piston, and having a piston-rod, E3, which extends through one head of the steam-chest, and is tted with two adjustable collars, F F', between which is placed the sliding collar F2, connected to an adjustable collar, F3, upon themain piston-rod by pivoted links F* F5. A hinged` bar, Fi, is attached to the head `of the steam-chest, and to its outer end is pivoted the link F, and thus a f ulcrum is obtained for the said link.

G represents the main valve, having supplemental ports G G2 and an eduction port or passage, G3.

Near one side of the main valve I cut a rabbet, within which is fitted the reversing-valve H, having induction-ports II H2, and an exhaust cavity, H3. The reversing valve is Fig. 3 is` made to fit closely betweenthe inner faces of the double-headed plunger and slides upon the upper face of the main valve, andthe two valves are operated by the reciprocation of thesaid double-headed piston. I

In order to start up the engine from the position shown in Fig. I, (and into which it cannot come again by its own working,) the supplemental piston may be moved to the left, which will cause the reversing-valve to also `move to the left, and as the ports H2, G2, and D align themselves, steam is admitted into that end ofthe steam-chest designated by the letter I, which forms a separate chamber not in direct communication with the steam-supply pipe, and is separated from the steam-chest proper by the tightly-fitting piston-heads E E2, as shown in Fig. 1. At this same time the exhaust-passage H3 of the reversing-valve will communicate through the ports G and D with vthe chamber I at the left-hand end of the steamchest and permit of the said chamber I exhausting itself through the passages G3 and J into the main exhaust-pipe J', thus 4causing the valves and the double-headed piston to move to the left; but when the inside edge of 1 the port G has passed the outside edge of the steam-passage D, the exhaust from the chamber I will be closed, and the forward movement of the valves will be stopped by the compressed steam in the said chamber I and passage D. While the aforesaid movements are taking place, the main valve opens the main port G2, admitting steam into the main cylinder and driving the piston to the left until, through the link movement attached to the main piston-rod, the sliding collar F2 is brought into contact with the fixed collar F', and thereby moves the double-headed piston and the valves back again toward the right and opens the steam-ports H and G', thus admitting live steam into the chamber I through the passage D. In the meantime the passage D from the chamber I is open to the small space lettered K between the inside face of the piston-head E2 and the end of the main valve, thus equalizing the .pressure on both ends of the valvepiston, the exhaust at the time being closed to both ends until the main valve is nearly closed to the right. Then by the reason of the lead that the port GZ has over the port D, the steam will be exhausted from the chamber I IOO until the inner edge of the port Gf2 passes the outer edge of the passage D, when the main valve will open the induction-passage C to the left-hand end of the main cylinder, and at the same time open the exhaust through C2 to the open air, thus reversing the motion of the piston.

The valve-1notion herein shown and described niay be changed by substituting a B- valve for the D main slide-valve, anda straight arm be carried by the piston-rod, instead of the links or pivoted levers shown, and the eollars F and F moved to suit the increased travel of the last-mentioned vertical straight arm upon the slide-valve piston-rod.

lt will be seen from the above that theleakage of steam through the valve-piston is reduced to a minimum, as the exhaust-passage from the steam-chest is only open during onelialf of the stroke or travel of the main valve, said movement being made very rapidly, and

only enough steam is exhausted to allow of sufieient movement of the main valve.

Having thus described my invention, what I elaim, and desire to secure by Letters Patent, 1s-

In a steam-actuated valve, the combination of the cylinder A, havinga piston, B, provided Wit-h piston-rod B', the steam-chest C. having ports C C? D D', and exhaust-spout J J', the plunger E, having heads E E2 and rod E", said rods B and E being connected by means of adj ustable collars and links, as shown, the rabbeted valve G, having ports G Gr2 G, and the reversing-valve H, having ports II II"y II", all substantially as described.

In testimony that I elaiin the foregoing I have hereunto set my hand and seal.

HENRY KESSLER. [1.. s.]

Titnesses XV. M. SMITH, CHAs. E. KELLY. 

